Buzz
Despite countless UFO sightings and theories from Area 51 enthusiasts, humanity has not yet received any communication from extraterrestrial life—no ETs, no Ewoks, just silence.
Considering the immense progress we've made in technology over the past century, it's highly probable that alien civilizations who began their space journeys just a few centuries ahead of us could be far more advanced than we are today.
We’ve come up with many potential methods for sending messages across the vastness of space. So, if incredibly advanced aliens wished to contact us, here are some ways they might do so.
10. Basic Radio Waves
This is the classic idea most people have when they imagine communicating with aliens. Receiving messages in this way has been explored in numerous books and films, like Contact and Independence Day, and it’s a solid starting point.
After all, we've been experimenting with radio waves for more than 100 years, and we’ve gotten pretty skilled at it. Many respected scientists and organizations, such as SETI, devote their efforts to monitoring for extraterrestrial signals using radio waves.
In fact, there was a possible detection in the 1970s with the famous WOW! signal, a mysterious burst of radio emissions from a nearby star cluster that remains unexplained to this day.
However, this method has some significant drawbacks. Radio waves weaken as they travel farther from the source, so the signals we’ve been sending for the past century are practically unreadable after just a few dozen light-years.
We could address this issue with larger radio dishes, but creating truly massive ones comes with many engineering challenges. In theory, a highly advanced civilization might be able to overcome these obstacles with their superior technology, but they would likely opt for something more exciting from the options below.
9. Lasers, Naturally!
While radio waves become almost impossible to interpret over vast cosmic distances, lasers could offer a more practical solution for communication. The signal remains intact over much greater distances, and it would appear distinct to us here on Earth.
Lasers allow targeting specific celestial bodies, making the process much more efficient compared to radio waves, which disperse in all directions. Advanced civilizations could use this method to send messages to systems hundreds of light-years away, and the bright laser flash would be easily noticeable from Earth.
The real challenge is: What light frequency should be chosen for transmitting the laser signal?
If a civilization is advanced enough, they could send enormous gamma ray bursts into space. These would last for an extended period and would certainly be noticeable. However, such an endeavor would require immense amounts of energy. But let's assume the aliens have that kind of power at their disposal.
A more feasible scenario for us humans might involve using infrared or microwave lasers, as they need much less energy. In fact, we’re already experimenting with this technology.
8. Starlight
You’ve likely heard of the Kepler Space Telescope. It’s a NASA tool designed to find exoplanets by detecting the dip in a star's light when an exoplanet passes in front of it.
But imagine if a more advanced civilization than ours placed a massive rectangle in orbit around a star? Or perhaps a triangle? Or even an oddly shaped 1,258-gon (a 1,258-sided geometric figure)? We would just need to decipher what this anomaly would look like in the data from the telescope, which is definitely possible.
The alien civilization doesn’t even need to be that advanced. In just a few hundred years, humanity could likely achieve something similar. All that would be required is to create an incredibly thin object, possibly made from carbon fiber or a similar material, and assemble it in sections while in orbit.
These structures would need to span the size of a large planet in order to be noticeable. However, again, a highly advanced alien species shouldn’t find it difficult to construct something like this.
Personally, I’d be fine with aliens sending us a few geometry challenges.
7. Dyson Spheres or Dyson Swarm
This concept is similar to the previous one, but here the civilization is more advanced, and their main goal isn’t to make contact with us. Instead, their objective is to harness the entire energy output of a star.
Here’s the idea: Instead of just placing massive metal structures into orbit, why not deploy billions of large solar panels to capture a star’s energy? It may seem outlandish, but given the pace of technological advancement, humanity could likely achieve this in a few hundred or thousand years.
The alien civilization might manipulate starlight to transmit some sort of intelligent message. This could even be easier to detect than the effects of geometric structures due to the enormous dips in starlight.
The aliens could then use the energy gathered from the star to power colossal versions of other items on this list, like radio dishes. At this stage, the alien civilization would be terrifyingly more advanced than we are. If this type of activity is detected, it might not be wise to respond with a message.
6. Manipulating the Cosmos
A civilization millions of years ahead of us could potentially have the ability to manipulate the movements of celestial objects within their galaxy. They could easily alter nearby stars and other celestial bodies to grab our attention—speeding them up to near light speed, then slowing them down, repeating the process again and again. Sooner or later, someone would notice.
They could then change the brightness of a star or modify some other attribute of the celestial body they’re manipulating to send us a message—perhaps prime numbers, the digits of pi, or something else. The energy required would be enormous, and such technology is only found in the realm of science fiction.
Every night, astronomers scan the sky, searching for the unusual, and this would be an ideal way to catch our attention. Clearly, such capabilities would appear godlike to us.
5. Gravitational Waves
Humanity has recently acquired the capability to detect gravitational waves, which are rapid alterations in the curvature of space-time. In 2015, scientists at the Laser Interferometer Gravitational-Wave Observatory (LIGO) announced their discovery of these ripples in space and time, marking humanity's first detection of such waves.
So, an advanced civilization could manipulate a few neutron stars or black holes to generate a peculiar, unmistakably intelligent signal that our detectors would pick up. They could adjust the frequency and amplitude of these waves to encode information and send us a message.
Clearly, this would require an extraordinary level of technological expertise. The fascinating part is that our sensors can detect these waves from billions of light-years away, meaning any aliens performing such actions in the universe will be noticed by us.
These distortions in the fabric of the universe are minute, changing distances by less than the width of a proton. But if aliens truly wanted to grab our attention, they could amplify these waves so that the message would be unmistakably clear.
Alternatively, the aliens could make the waves so intense that they would conveniently eliminate all life forms capable of resisting them (such as humans), thereby preventing us from exploiting the Earth for resources.
4. Shower Us with High-Energy Particles
Earth is constantly bombarded with enormous amounts of radiation every day. However, if aliens could amplify this radiation and vary it in a way that sends us a signal, we would be able to detect it.
They could unleash an overwhelming number of high-energy cosmic rays, enough to increase our radiation exposure by a small but noticeable amount, prompting scientists to take notice. By varying the quantity of particles, they could encode a message.
Sure, this might not be the most environmentally friendly approach. But considering how advanced these aliens are, they’re probably not concerned with the preservation of biological life forms, like a few billion descendants of apes.
We currently have no method to implement this on a large scale, and we're uncertain how to properly target it. In fact, this may not even be the most efficient or sensible way to initiate contact with extraterrestrials. But if they possess such capabilities, who’s to say they shouldn’t try?
3. Manipulating The Laws Of Physics
When we gaze at the cosmos, we tend to believe that the same laws of physics apply universally and that these laws are fixed and unchanging. We hold this assumption, but what if we’re wrong?
Highly advanced extraterrestrials could have the ability to manipulate the laws of physics, making the aforementioned methods simpler or even possible. Perhaps they could send a message by altering something fundamental, such as the electron’s charge.
When you have control over the laws of physics, you essentially hold dominion over everything. Our tiny ape brains can hardly grasp the parts of the universe we’ve figured out, so such technology would probably make our minds overload.
Now that I think about it, they could just erase massive entities from existence in a completely different way. Instead of obliterating us with a fiery explosion, they could simply strip away our very ability to exist. After all, they hold the power over the laws of physics!
2. Wormholes
We still have no definitive evidence that wormholes can exist. Even if they’re theoretically possible, we don’t know of any method—natural or otherwise—that could create one.
At this point, things are getting really out there. Perhaps aliens could open a wormhole nearby, Interstellar-style, and use it to send physical objects that relay their radio signals or something of that nature.
Perhaps they could use the wormhole to deploy a fleet of their spacecraft for making contact. Or, they could send in those disassemblers from the previous idea, wipe us out of existence, and gather the remnants of what was once Earth.
1. Erasing Large Things From Existence
If they’re advanced enough, it’s completely within their capability. They could erase massive objects in a way that grabs our attention and then use another method to send a clear signal. Perhaps by releasing swarms of nanobots to break things down into elementary particles or using black holes as a convenient tool to remove things from existence. Fun, right?
A more pragmatic civilization might manipulate the decay rate of some cosmological object, perhaps causing a red dwarf star (a type of star that can last trillions of years) to burn out in a fraction of its expected lifespan. Scientists have never observed the death of a red dwarf star simply because the universe has existed for only a tiny portion of such a star's expected life.
